Documents disponibles écrits par cet auteur

Structural behavior of thin-walled metal silos subject to different flow channel sizes under eccentric discharge pressures / Sadowski, Adam J. in Journal of structural engineering, Vol. 138 N° 7 (Juillet 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 7 (Juillet 2012) . - pp. 922–931 Titre : Structural behavior of thin-walled metal silos subject to different flow channel sizes under eccentric discharge pressures Type de document : texte imprimé Auteurs : Sadowski, Adam J., Auteur ; Rotter, J. Michael, Auteur Année de publication : 2012 Article en page(s) : pp. 922–931 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Structural  stability  Thin-walled  metal  shell  Eccentric  discharge  Localized  compression  Imperfections  Buckling Résumé : The condition of eccentric discharge is known to be one of the most critical for the design of thin-walled cylindrical metal silos. Significant progress has been made in recent years in devising a relatively realistic set of representative pressures for this load case. However, the consequences these may have on the predicted structural behavior of a silo are not yet fully understood. This paper presents a detailed parametric study into the behavior of a custom-designed slender silo under a set of unsymmetrical pressures describing the action of an eccentric parallel-sided pipe flow channel of varying cross-sectional areas. The results are compared with the reference axisymmetric case of concentric discharge. It is found that the predicted behavior is very complex indeed, and that geometric nonlinearity is of much greater significance for cylindrical shells under unsymmetrical load patterns than under symmetrical patterns. Further, it is found that eigenmode-affine imperfections, which are very deleterious under axisymmetric loading patterns, are instead beneficial to the buckling strength of a silo under eccentric discharge, thus making them unsuitable for use in design for this load condition. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000530 [article] Structural behavior of thin-walled metal silos subject to different flow channel sizes under eccentric discharge pressures [texte imprimé] / Sadowski, Adam J., Auteur ; Rotter, J. Michael, Auteur . - 2012 . - pp. 922–931. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 7 (Juillet 2012) . - pp. 922–931 Mots-clés : Structural  stability  Thin-walled  metal  shell  Eccentric  discharge  Localized  compression  Imperfections  Buckling Résumé : The condition of eccentric discharge is known to be one of the most critical for the design of thin-walled cylindrical metal silos. Significant progress has been made in recent years in devising a relatively realistic set of representative pressures for this load case. However, the consequences these may have on the predicted structural behavior of a silo are not yet fully understood. This paper presents a detailed parametric study into the behavior of a custom-designed slender silo under a set of unsymmetrical pressures describing the action of an eccentric parallel-sided pipe flow channel of varying cross-sectional areas. The results are compared with the reference axisymmetric case of concentric discharge. It is found that the predicted behavior is very complex indeed, and that geometric nonlinearity is of much greater significance for cylindrical shells under unsymmetrical load patterns than under symmetrical patterns. Further, it is found that eigenmode-affine imperfections, which are very deleterious under axisymmetric loading patterns, are instead beneficial to the buckling strength of a silo under eccentric discharge, thus making them unsuitable for use in design for this load condition. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000530

Study of buckling in steel silos under eccentric discharge flows of stored solids / Sadowski, Adam J. in Journal of engineering mechanics, Vol. 136 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 6 (Juin 2010) . - pp. 769-776 Titre : Study of buckling in steel silos under eccentric discharge flows of stored solids Type de document : texte imprimé Auteurs : Sadowski, Adam J., Auteur ; Rotter, J. Michael, Auteur Article en page(s) : pp. 769-776 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Thin  shell  structures  Solids  flow  Silos  Structural  stability  Buckling  Nonlinear  analysis  Computer  analysis. Résumé : The most serious loading condition for slender thin-walled metal silos has long been recognized to be the condition of discharge, with eccentric discharge causing more catastrophic failures than any other. Two key reasons for this high failure rate are the difficulties in characterizing the pressure distribution caused by eccentric solids flow, and in understanding the associated unsymmetrical stresses in the silo wall. Few studies have addressed either the linear elastic behavior of such a silo or its buckling failure under eccentric discharge. In this study, the eccentric discharge pressures are characterized using the new rules of the European Standard EN 1991-4 on Silos and Tanks. This novel description of unsymmetrical pressures permits a study of the structural behavior leading to buckling during eccentric discharge, including the critical effects of change of geometry and imperfection sensitivity, to be undertaken using geometrically and materially nonlinear computational analyses. The mechanics of the behavior are found to be quite complicated. A silo which is safe under axisymmetric loading is found to be susceptible to catastrophic stability failure under eccentric discharge. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Study of buckling in steel silos under eccentric discharge flows of stored solids [texte imprimé] / Sadowski, Adam J., Auteur ; Rotter, J. Michael, Auteur . - pp. 769-776. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 6 (Juin 2010) . - pp. 769-776 Mots-clés : Thin  shell  structures  Solids  flow  Silos  Structural  stability  Buckling  Nonlinear  analysis  Computer  analysis. Résumé : The most serious loading condition for slender thin-walled metal silos has long been recognized to be the condition of discharge, with eccentric discharge causing more catastrophic failures than any other. Two key reasons for this high failure rate are the difficulties in characterizing the pressure distribution caused by eccentric solids flow, and in understanding the associated unsymmetrical stresses in the silo wall. Few studies have addressed either the linear elastic behavior of such a silo or its buckling failure under eccentric discharge. In this study, the eccentric discharge pressures are characterized using the new rules of the European Standard EN 1991-4 on Silos and Tanks. This novel description of unsymmetrical pressures permits a study of the structural behavior leading to buckling during eccentric discharge, including the critical effects of change of geometry and imperfection sensitivity, to be undertaken using geometrically and materially nonlinear computational analyses. The mechanics of the behavior are found to be quite complicated. A silo which is safe under axisymmetric loading is found to be susceptible to catastrophic stability failure under eccentric discharge. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]